β Grain Growth Kinetics of a New Metastable β Titanium Alloy

Fei, Yue; Wang, Xin Nan; Zhi, Zhang; Li, Jun; Shang, Guo Qiang; Zhu, Li Wei

doi:10.4028/www.scientific.net/msf.747-748.844

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…In previous research, it has been reported that the activation energy for grain boundary self-diffusion in β titanium alloys ranged from 145−315 kJ mol −1 [28]. The grain-growth activation energy for TC4-DT alloy that obtained from the modified model exists in the lower portion within this range, which is higher than 20 kJ mol −1 for pure Ti and 56 kJ mol −1 for Ti-0.2Pd alloy, and smaller than that of other titanium alloys with high solute element, such as 274 kJ mol −1 for Ti-Mo-Nb-Cr-Al-Fe-Si alloy [29] and 272.16 kJ mol −1 for Ti-20Mo alloy [30]. The content of solute atoms has a significant effect on the activation energy of graingrowth, which results from the fact that a high solute addition can retard the grain-boundary migration, leading to the high activation energy and different growth kinetics.…”

Section: 741mentioning

confidence: 82%

Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy

Dong

Cai

et al. 2020

Mater. Res. Express

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Grain-growth behaviors of TC4-DT alloy in a narrow temperature range (990°C−1050°C) were systematically investigated, and the effects of which on the lamellar structural evolution and mechanical properties were quantitatively evaluated. Microstructural observations indicated that prior β grain size increased with an increase in heat-treatment temperature and time, which was described by the modified Sellars model. The grain-growth exponent (n=2.741) and activation energy (Q=161.0 kJ mol −1 ) during β treatment were confirmed. The α colony size similar to β grain varied significantly with the heat-treatment conditions, while α plate thickness changed slightly. The Hall-Petch equation could qualitatively exhibit the relationships between the lamellar microstructure parameters (prior β grain size, α colony size, and α plate thickness) and mechanical properties (strength, ductility, and impact toughness). The fine prior β grain that contained different orientated α colonies produced more boundaries to hinder dislocation motion and crack propagation, which contributed a more circuitous crack growth path. The results indicated that the control of α colony size was critical to improve the mechanical performance of TC4-DT alloy.

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Section: 741mentioning

confidence: 82%

Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy

Dong

Cai

et al. 2020

Mater. Res. Express

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“…In addition, most of the metastable β titanium alloys contain alloy elements which could improve the strength of α phase through solution strengthening. Therefore, the metastable β titanium alloy can obtain higher strength level than α+β phase titanium alloy [17][18][19][20].…”

Section: Resultsmentioning

confidence: 99%

Effect of Heat Treatment Process on Microstructure of a New Metastable β Titanium Alloy

Wang

Xin

et al. 2020

MSF

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The effects of solution temperature and aging temperature on microstructure of a new metastable β titanium alloy were studied. With the decrease of solution temperature, β grain size gradually decreased. When the solution temperature dropped to 780°C, the average grain size was about 10 μm. As the aging temperature increased from 500 °C to 560 °C, the secondary α phase increased. The nucleation of the secondary α phase within the grain was uniform, and its relationship with the β matrix was satisfied with Burgers. With the extension of aging time, the amount of the secondary α phases increased obviously, and they had a staggered arrangement with each other, presenting the phenomenon of the tensile strength increasing continuously. The strength level reached to 1500 MPa after aging at 500 °C for 8 h.

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“…Eventually, the uniform and refined b grains are formed. However, the recrystallization kinetics of b grains in the b region is extremely fast [28,29]. Therefore, the refining of b grains is not very effective.…”

Section: Microstructure and Recrystallizationmentioning

confidence: 99%

Effectiveness of hot deformation and subsequent annealing for β grain refinement of Ti–5Al–5Mo–5V–1Cr–1Fe titanium alloy

Cui

Zheng

et al. 2021

Rare Met.

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High strength titanium alloys suffer from a limited combination of strength and ductility. Considering their microstructure, the coarse b grain is a detrimental factor. In the present study, the effects of hot deformation and annealing treatment on the b grain refinement of Ti-5Al-5Mo-5V-1Cr-1Fe (TC18) titanium alloy have been investigated by using electronic backscattered diffraction (EBSD) and transmission electric microscopy (TEM). Hot compression tests of TC18 alloy were performed between 1073 and 1223 K at strain rates of 0.01 and 0.10 s -1 . Subsequent annealing treatments were conducted to investigate the effect of deformation microstructure on the recrystallization behavior of b grains. The results indicate that dynamic recovery (DRV) is the dominant restoration mechanism during hot deformation. Discontinuous dynamic recrystallization (dDRX) is significantly limited at a higher temperature in the b region, whereas continuous dynamic recrystallization (cDRX) of the b phase is observed at a higher strain rate in the (a ? b) region. The final annealing microstructure is highly dependent on the deformation microstructure. Limited dDRX during hot deformation could not effectively refine the b grains. The refined and uniform b grains with an average grain size of 12 lm are achieved by combining hot deformation and subsequent annealing in the (a ? b) region. This study provides a guide for the b grain refinement of high strength titanium alloys.

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β Grain Growth Kinetics of a New Metastable β Titanium Alloy

Cited by 8 publications

References 23 publications

Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy

Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy

Effect of Heat Treatment Process on Microstructure of a New Metastable β Titanium Alloy

Effectiveness of hot deformation and subsequent annealing for β grain refinement of Ti–5Al–5Mo–5V–1Cr–1Fe titanium alloy

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